John D Rockefeller's net worth in 2007 dollars is 663 billion. Lets look at some statistics-

If he was alive now, and gave all of his money to helping pay off the national debt, he wouldn't even be paying off 1/16 of the amount the US owes- which is 16 trillion.

If he put all of his money into the bank and lived off of the interest, he would earn 51 billion dollars a year. 1.4 year's salary would make him the richest person in the world, still with 700 billion dollars in the bank.

the average amount of money a house is in 2010 was 317,000 dollars. That means Rockefeller could buy 2,091,482 average houses. So,he could buy a house for every single homeless person in the united states, and still have 1,461,482 houses left.
Which he could then rent out, earning 17,537,784,000 dollars a year.

2nd fact is kinda funny, because I was watching a show about a week ago on History that said J.P. Morgan, one of Rockefellers business rivals, actually bailed out Congress when it got into debt back than.